Gelmaiek



(No Model.)

W. H. STIEGELMAIER. ELECTRIC TEMPERATURE ALARM AND THERMOSTAT.

No. 351,134. Patented Oct. 19, 1886.

Fig.2

WITNESSES i IN VENTOR ATTDRNEYS.

UNITED STATES PATENT OEEicE.

"WILLIAM HENRY STIEGELMAIER, OF GENEVA, NEXV YORK.

ELECTRIC TEMPERATURE-ALARM AND THERiHGSTfi T.

filFECIFICATION forming part of Letters Patent No. 351,134, dated October 19,1886.

Application filed February 2, 1886. Serial No. 190,621. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM HENRY STU} oicLiLiIEn, of Geneva, in The county of On tario and State of New York, have invented a. new and useful Improvement in Electric Temperaturertlarms and Thermostats, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a front elevation. Fig. 2 is a vertical transverse section taken on line a; a; in Fig. 1. Fig. 3 is a detail view of a modiiied form of electrical contact.

Similar letters of reference indicate corre spouding parts in the different figures of the drawings.

The object of my invention is to provide an accurate and eflioient device for making and breaking an electric circuit by the rise and fall of temperature.

My invention consists in the combination, with the mercury tube and case of a balancethermometer, of an electric contact carried by the tube and adjustable contact-points ar- U ranged in the back of the thermometer-case in position to be touched by the contact carried by the tube, as hereinafter more fully described.

The case A and balanced mercury-tube B of the balmice-thermometer are or" the usual Well known description, the case A being of sectoral form, having the curved. scale C in the wider end. To the non-conducting back of the easing, concentric with the scale C, is placed a U -shaped support, D, having in the upper ends of its arms cups for receiving the points a, forming the pivots of the thermometer-tube. The points a are formed integrally with the strip Z), which is returned upon itself, the two arms of the strip being connected by an adjusting-screw, c. The strip bis secured adjustably to the tube of the thermometer by a winding, (1, of wire. To the strip 1) is secured a copper strip, (2, which extends along the upper surface of the tube of the thermometer, parallel with it, then around the bulb of the thermometer, and under thethermometer-tube, the remaining extremity being received under the wire winding (Z. The U-shaped support D and the strip 7) are in electrical connection with. each other and with the wire conductor f, which leads to the battery E. v

In the back ofthe thermometer-case is formed a curved slot for receiving the two curved slides 51, inserted from opposite sides of the casing. The slides g g are retained in place in the groove in the thermom etercase by a slotted curved plate, h, which covers the edges of the slides. Each slide gy is provided with an electrical contaet-pin, j, which projects outward into the case of the thermometer through the slot of the plate It into the path of the then mometentube, so that as the thermometer tube rises or falls the strip 6 may strike one or the other of the contact-pinsj.

For convenience in adjusting the contactpinsj, the edge of the plate nearest the pivot of, the thermometer-tube is provided with a scale, 1', corresponding with the scale C, but necessarily placed in an inverted position, on account of being on the opposite side of the pivot of the thermometer-tnbe.

To insure a good electrical contact with the slides gg, the bottom of the groove in which these slides are placed is provided with me tallic plate, It. The metallic plate It is con nected by a wire, Z, with one binding-post of an electrical bell,l which may be of any ordinary wellknown construction, the other binding-post of the bell being connected by the wire in with the remaining pole of the battery E.

Instead of taking the current through the support and pivots of the thermometer-tube, as already described, I may, as in Fig. 3, attach to the tube an arm, 6, arranged to touch the pins j, and I may connect the arm 0 directly with the battery by means of the wiref.

The slides g are adjusted according to the marks on the scale 2', so that the strip e,carried by the therinometer-tube, will touch them when the maximum and minimum of temperature is reached. When the mercury falls in the tube, the weight of the bulb of the tube being increased, that end of the tube preponden ates and brings the strip 2 into contact with the pinj of the lower slide, g, and when the mercury in the tube expands the bulb becoming lighter, the opposite end preponderates and brings the strip a into contact with the contact-pin j of the upper slide, 1. By

ICO

means of this arrangement theelectric circuit is completed and an alarm is given whenever the strip 6 strikes either of the pinsj.

' It will be observed that the slides g 9 may be adjusted so as to cause an alarm at any point, and the contact-pins j may be placed so near the strip 6 as to cause an alarm to be given by the variation of a fraction of adegree.

My improved alarm and thermostat may be connected with an electromagnetic damperregulator for furnaces or with the regulators of incubators. It may also be employed to great advantage in greenhouses, and in other places wherea constanttemperatureis desired.

' It may be used as a thermostat for giving automatic fire-alarms, and in other places where only the maximum or minimum of temperature is to be indicated. In the case of a maximum temperature the upper contactpin j only need be used, and where an alarm is desired for a minimum temperature only the lower contact-pinj may be used.

Having thus describedmy invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a balance-thermometer tube and its conductive fulcrum, of a sustaining case or frame supporting said fulcrum and having two sets of graduations, one upon each side of the fulcrum, and reading or progressing in opposite directions, a conducting-strip carried by the thermometer-tube and electrically connected to the fulcrum, and one or, more adjustable contact-points supported by the frame crease and disposed in range of engagement with the electrical connection of the fulcrum, substantially as and for the purpose described.

- 2. The combination, with the casing Aand balanced thermometer-tube B, of the metallic support D, fixed to the non-conducting back support D the slides 99, received in a groove in the back of the thermometer-case, and carrying contact-pins j on opposite sides of the thermometer tube, substantially as herein shown and described. I

4. The combinatiomwith the balanced mercury-tube B, metallic strip 6. and electrical conductors connected therewith, of theadjustable slides g", carrying the contact pinsj,and the auxiliary scale z, substantially as herein shown and described.

WlLlilAlll llENR-Y S'IIEGELMAIER.

, Witnesses:

JOHN KAMP UNDERwooi), HIRAM ARMSTRONG. 

